If you place them further up the wall you may find the draft inside the home to be excessive and there are better options to consider.
Vent in brick wall.
In this case the drainage and ventilation of this large brick wall is left to 30 small weep holes spaced at 2 foot intervals along the bottom course of the wall.
Air brick wall vents are designed to create an airflow underneath a suspended floor.
Brick vents are ideal for crawl space between floor or bath exhaust.
Always wear safety glasses.
Weep holes in building exterior masonry walls brick or stone are a drainage system that is used in cavity wall or rain screen wall construction methods to get rid of water that has penetrated the outer wall skin or surface.
Air is pulled in through one side of the home and exits the opposite side.
This task may seem intimidating if the wall that must accommodate the dryer vent hole is made of brick but in reality creating the hole for the vent is fairly simple.